/Engine/Source/Editor/SubobjectDataInterface/Public/SubobjectData.h
Add the given subobject handle as a child of this. NOTE: This does NOT do any actual manipulation of the subobject structure. This only updates this subobject to have the correct handles in it's child structure. Actual manipulation of subobjects should be done via the SubobjectSubsystem.
bool AddChildHandleOnly ( const [FSubobjectDataHandle](API\Editor\SubobjectDataInterface\FSubobjectDataHandle) & InHandle )